Micro-grid real-time simulation method for processing multi-break switches of power systems

Abstract

The invention discloses a micro-grid real-time simulation method for processing multi-break switches of power systems. The method comprises the following steps of: judging a time period of an action moment of an electronic power switch, and calculating a correct switch time point by adoption of a linear interpolation method; if a plurality of switch motions exist in a certain time step length, selecting the average value of switch motion time points as a uniform switch motion point in the step length, and calculating a system state variable at the moment by adoption of an interpolation method; and introducing a segmented function parameter and calculating an integral weight according to a specific position of a switch motion average moment in the step length, after one step or two steps, carrying out Euler's integral to the next whole step time point to obtain a correct network topology and a correct system initial value at the moment, and converting to an implicit trapezoidal integral method to complete global calculation. The method disclosed by the invention can be used for effectively solving the traditional difficulty that the simulation efficiency and correctness are influenced by the high-frequency change of the system topology as multi-break switches occur in the same step length during the electromagnetic transient real-time simulation of the power systems.

Description

technical field [0001] The invention relates to power system simulation, in particular to a microgrid real-time simulation method for multiple switch processing of the power system. Background technique [0002] Based on considerations of economy and safety, time-domain simulation has become an important tool for power system analysis, design and research. At present, power electronic technology has been widely used in all aspects of power systems including flexible AC transmission, high-voltage direct current transmission and distributed power generation. The network topology of power electronics, which is essentially changing with time, poses new requirements and challenges to traditional power system time domain simulation. For system-level electromagnetic transient simulation, the main emphasis is on the influence of power electronic devices on the system as a whole. At this time, an overly detailed switch model is not necessary, and a simplified ideal switch model can ...

AI Technical Summary

Problems solved by technology

Until now, in terms of resynchronization between simulation and real time, due to the use of more interpolation times, the simulation speed is affected, and it is not suitable for real-time simulation of electromagnetic transients.

At the same time, multiple actions of the switch within the same step length will make the simulation difficult to detect and calculate, which is also a major problem in the real-time simulation of electromagnetic transients

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